A source told ESPN Bosch had written the list in April, indicating Braun owed him money for performance-enhancing drugs.

The list also included Alex Rodriguez, Melky Cabrera and Francisco Cervelli.

Earlier this month, Yahoo Sports reported the 2011 NL MVP's name showed up three times in records of the Biogenesis of America. Yahoo said no specific performance-enhancing drugs were listed next to his name.

Braun said he used the person who ran the Florida clinic only as a consultant on his drug suspension appeal last year.

Braun said his name was in the Biogenesis records because of an issue over payment to Bosch, who ran the clinic near Miami.

"There was a dispute over compensation for Bosch's work, which is why my lawyer and I are listed under 'moneys owed' and not on any other list," Braun said.

Braun has pledged complete cooperation with any investigation of Biogenesis of America, which is now defunct.

The latest report does not prove that Braun used or received performance-enhancing drugs, but at some point, he will have to explain that link to Major League Baseball officials who are investigating.

Braun arrived at spring training Friday morning, before the ESPN story broke, and told reporters that he would not discuss the Biogenesis clinic.

"I'm here, but I made a statement last week. I stand behind that statement. (I'm) not going to address that issue any further. As I stated, I'm happy to cooperate fully with any investigation into this matter," Braun said. "I respect the fact that all you guys have a job to do. Part of that job includes asking me questions. I'm happy to answer any and all questions about baseball."

When asked about baseball's recent announcement that players will be subject to in-season, unannounced testing for human growth hormone, Braun said he's "always been supportive of additional drug testing."